I would love to have a three minute projection audible warning before entering space which requires a clearance. That is class B, C, D, and maybe even TRSA just because. Also restricted and prohibited space. Would anyone else?
Seems like a great option... make it configurable (on/off, distance and/or time to airspace, allow which airspaces you want alerts for)... Seems like a relatively easy option to add from a software perspective... but shouldn't come before general mx and bug fixes of course.